i bled the system properly ! the problem is there is endless air in there i have been bleeding it for the past six hours and have never had to do it for more than 20 min before. i dont know whats wrong , its just air and steam coming out the bleeder screw then some coolant. but as i let the car warm up, more air and steam followed by more coolant ect.

What do you mean "as I let the car warm up"? Are you running the engine with the bleeder screw open?